To identify the number of physical cpu’s you have on a server you can execute the command
-bash-3.2$ grep ‘physical id’ /proc/cpuinfo | sort -uphysical id : 0physical id : 1
This means you have 2 cpu’s (You can add a | wc -l to the previous command to just get the count)
To identify the number of cores per cpu you can execute the command
-bash-3.2$ grep ‘cores’ /proc/cpuinfo | sort -u
cpu cores : 4
To check if hyperthreading is turned on in the bios
-bash-3.2$ egrep ‘cores|siblings’ /proc/cpuinfo | sort -usiblings : 8cpu cores : 4
If cpu cores equal the number of siblings then hyperthreading is off. If siblings is a multiple of cores then hyperthreading is turned on.
If you want to see the number of cpu’s being seen by the operating systems then you can
grep ‘processor’ /proc/cpuinfo | wc -l
or
run the top command and once the output display’s you can just press the 1 key and it will show the utilization for each cpu on the top.
